@Article{ 
  Sch12,
  author = { Schmidt, Thomas },
  title = { ${\rm W}^{2,1+\varepsilon}$ estimates for the Monge-Ampère equation },
  journal = { Adv. Math. },
  year = { 2013 },
  volume = { 240 },
  pages = { 672-689 },
  URL = { http://cvgmt.sns.it/paper/1779/ },
  note = { cvgmt preprint}
}